SpaceX Chief Executive Elon Musk said the company would start test flights of its next-generation Starship vehicle in as soon as one to two months and reach orbit in as little as six months, even as some complain the company is devoting too many resources to this project.

The Russian space agency’s first official reaction to the successful March 3 docking of SpaceX’s Crew Dragon spacecraft with the International Space Station congratulated NASA but didn’t mention SpaceX or its founder, Elon Musk.

SpaceX announced Sept. 17 that a Japanese billionaire will be paying an undisclosed but significant sum to buy a flight of the company’s next-generation rocket for a flight around the moon carrying a group of artists.